TCC (undergraduate) - Federal University of Santa Catarina. Health Sciences Center. Dentistry.Introduction: There is currently a great demand for the use of dental implant systems for the replacement of missing teeth. Faced with this demand, the aesthetic requirement is increasing, and new materials have been developed for implant-supported rehabilitation. The objective of this study was to compare the topography of titanium and zirconia samples, before and after exposure to topical gels of Sodium fluoride at 12300 ppm and 36% carbamide peroxide. Materials and methods: Samples of zirconia, commercially pure titanium (Ti-cp) and Ti6Al4V alloys were prepared with silicon carbide sieves up to 2500 mesh, polished with (0.1 to 1 μm) and with colloidal silica solution (0.04 μm) under polystyrene lubrication. Afterward, all samples were cleaned under immersion in isopropyl alcohol for 15 min and in distilled water for 5 min in an ultrasonic bath. The roughness analysis was performed by optical profilometry, measuring the Ra and Rt parameters before and after immersion in the therapeutic solutions for 15 min. Images by scanning electron microscopy (SEM) were performed to inspect the topographic changes. Results: Titanium-based samples, when submitted to fluoride applications, showed visible topographic changes in images obtained by SEM, and by statistically relevant optical profile, with the Ti-cp samples showing the greatest changes. When subjected to the application of 35% hydrogen peroxide, the titanium samples showed discrete changes. Conclusions: Zirconia presented greater chemical resistance to the action of the solutions tested in comparison with Ti-cp and Ti6Al4V. Sodium fluoride 12300ppm was aggressive to the surfaces of titanium-based materials. The exposure of zirconia, Ti-cp and Ti6Al4V to hydrogen peroxide for 16 minutes did not promote marked but statistically relevant topographic changes (p <0.05). Currently, there is a large demand on the use of osseointegrated dental implants Systems to replace missing teeth. Due to this demand, the need for aesthetic is increasing and new materials have been developed for implant-supported rehabilitation. However, little is known about the corrosive effects that dental therapeutic substances may cause in these materials. Objectives: This study aimed to compare the topography of titanium and zirconia samples before and after exposure to topical gels of sodium fluoride at 12300 ppm and Carbamide peroxide at 36%. Materials and Methods: Zirconia samples, commercially pure titanium (cp-Ti) and alloys Ti6Al4V samples were prepared with SiC paper up to 2500 mesh, polished with diamond pastes (between 0.1 and 1 μm) and silica colloidal solution (0.04 μm) Along with polisher under lubrication. Then, all samples were cleaned by soaking in isopropyl alcohol for 15 min and distilled for 5 min in the ultrasonic bath. Analysis of surface roughness was performed by optical profilometry, measuring the Ra and Rt parameters before and after application of therapeutic solutions for 15 min. Images obtained by scanning electron microscopy (SEM) were performed in order to inspect the topographical changes. \ Ud Results: The titanium-based samples, when exposed to fluoride applications presented visible topographical changes on images obtained by SEM and optical profilometry, statistically relevant, Being the Ti-cp samples that presented the greatest alteration. When subjected to the application of 35% hydrogen peroxide, titanium samples presented minor changes. The zirconia, exposed to both substances presented in the significant alterations, nevertheless statistically relevant. \ Ud Conclusions: Zirconia presented higher chemical resistance to the action of the tested solutions compared to the Ti-cp and Ti6Al4V. Sodium fluoride 12300ppm proved to be aggressive on surfaces of titanium-based materials. (P <0.05), but did not cause major topographical changes, however statistically relevant (p <0.05)
By Johanna Koch Schmitz
Source: https://core.ac.uk/display/30412757
By Johanna Koch Schmitz
Source: https://core.ac.uk/display/30412757


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